decoder

README

Decoders

In pipeline settings there is a parameter for choosing desired decoding format. By default, every pipeline utilizes json decoder, which tries to parse json from log.

Some decoders support parameters, you can specify them in decoder_params.

Available values for decoder param:

• auto -- selects decoder type depending on input (e.g. for k8s input plugin, the decoder will be selected depending on container runtime version)
• json -- parses json format from log into event
• raw -- writes raw log into event message field
• cri -- parses cri format from log into event (e.g. 2016-10-06T00:17:09.669794203Z stderr F log content)
• postgres -- parses postgres format from log into event (e.g. 2021-06-22 16:24:27 GMT [7291] => [3-1] client=test_client,db=test_db,user=test_user LOG: listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\"\n)
• nginx_error -- parses nginx error log format from log into event (e.g. 2022/08/17 10:49:27 [error] 2725122#2725122: *792412315 lua udp socket read timed out, context: ngx.timer)
• protobuf -- parses protobuf message into event

Currently auto is available only for usage with k8s input plugin.

Json decoder

Params

• json_max_fields_size - map {path}: {limit} where {path} is path to field (cfg.FieldSelector) and {limit} is integer limit of the field length. If set, the fields will be cut to the specified limit.

  It works only with string values. If the field doesn't exist or isn't a string, it will be skipped.

Examples

Default decoder:

pipelines:
  example:
    settings:
      decoder: 'json'

From:

"{\"level\":\"error\",\"message\":\"error occurred\",\"ts\":\"2023-10-30T13:35:33.638720813Z\",\"stream\":\"stderr\"}"

To:

{
  "level": "error",
  "message": "error occurred",
  "ts": "2023-10-30T13:35:33.638720813Z",
  "stream": "stderr"
}

---

Decoder with json_max_fields_size param:

pipelines:
  example:
    settings:
      decoder: 'json'
      decoder_params:
        json_max_fields_size:
          level: 3
          message: 5
          ts: 10

From:

"{\"level\":\"error\",\"message\":\"error occurred\",\"ts\":\"2023-10-30T13:35:33.638720813Z\",\"stream\":\"stderr\"}"

To:

{
  "level": "err",
  "message": "error",
  "ts": "2023-10-30",
  "stream": "stderr"
}

Nginx decoder

Params

• nginx_with_custom_fields - if set, custom fields will be extracted.

Examples

Default decoder:

pipelines:
  example:
    settings:
      decoder: 'nginx_error'

From:

"2022/08/17 10:49:27 [error] 2725122#2725122: *792412315 lua udp socket read timed out, context: ngx.timer"

To:

{
  "time": "2022/08/17 10:49:27",
  "level": "error",
  "pid": "2725122",
  "tid": "2725122",
  "cid": "792412315",
  "message": "lua udp socket read timed out, context: ngx.timer"
}

---

Decoder with nginx_with_custom_fields param:

pipelines:
  example:
    settings:
      decoder: 'nginx_error'
      decoder_params:
        nginx_with_custom_fields: true

From:

2022/08/18 09:29:37 [error] 844935#844935: *44934601 upstream timed out (110: Operation timed out), while connecting to upstream, client: 10.125.172.251, server: , request: "POST /download HTTP/1.1", upstream: "http://10.117.246.15:84/download", host: "mpm-youtube-downloader-38.name.tldn:84"

To:

{
  "time": "2022/08/18 09:29:37",
  "level": "error",
  "pid": "844935",
  "tid": "844935",
  "cid": "44934601",
  "message": "upstream timed out (110: Operation timed out), while connecting to upstream",
  "client": "10.125.172.251",
  "server": "",
  "request": "POST /download HTTP/1.1",
  "upstream": "http://10.117.246.15:84/download",
  "host": "mpm-youtube-downloader-38.name.tldn:84"
}

Protobuf decoder

For correct decoding, the protocol scheme and message name are required. They must be specified in decoder_params.

Params

• proto_file - protocol scheme, can be specified as both the path to the file and the contents of the file.
• proto_message - message name in the specified proto_file.
• proto_import_paths - optional list of paths within which the search will occur (including imports in proto_file). If present and not empty, then all file paths to find are assumed to be relative to one of these paths. Otherwise, all file paths to find are assumed to be relative to the current working directory.

If proto_file contains only system imports, then there is no need to add these files to one of the directories specified in proto_import_paths. Otherwise, all imports specified in the proto_file must be added to one of the directories specified in proto_import_paths respecting the file system tree.

List of system imports:

• google/protobuf/any.proto
• google/protobuf/api.proto
• google/protobuf/compiler/plugin.proto
• google/protobuf/descriptor.proto
• google/protobuf/duration.proto
• google/protobuf/empty.proto
• google/protobuf/field_mask.proto
• google/protobuf/source_context.proto
• google/protobuf/struct.proto
• google/protobuf/timestamp.proto
• google/protobuf/type.proto
• google/protobuf/wrappers.proto

Examples

Decoder with proto-file path:

pipelines:
  example:
    settings:
      decoder: protobuf
      decoder_params:
        proto_file: 'path/to/proto/example.proto'
        proto_message: MyMessage

Decoder with proto-file content:

pipelines:
  example:
    settings:
      decoder: protobuf
      decoder_params:
        proto_file: |
          syntax = "proto3";

          package example;
          option go_package = "example.v1";

          message Data {
            string string_data = 1;
            int32 int_data = 2;
          }

          message MyMessage {
            message InternalData {
              repeated string my_strings = 1;
              bool is_valid = 2;
            }

            Data data = 1;
            InternalData internal_data = 2;
            uint64 version = 3;
          }
        proto_message: MyMessage

Decoder with proto_import_paths:

pipelines:
  example:
    settings:
      decoder: protobuf
      decoder_params:
        proto_file: 'example.proto'
        proto_message: MyMessage
        proto_import_paths:
          - path/to/proto_dir1
          - path/to/proto_dir2

Documentation

Index

• func DecodePostgresToJson(event *insaneJSON.Root, data []byte) error
• type CRIRow
  • func DecodeCRI(data []byte) (row CRIRow, _ error)
• type Decoder
  • func NewJsonDecoder(params map[string]any) (Decoder, error)
  • func NewNginxErrorDecoder(params map[string]any) (Decoder, error)
  • func NewProtobufDecoder(params map[string]any) (Decoder, error)
• type NginxErrorRow
• type PostgresRow
  • func DecodePostgres(data []byte) (PostgresRow, error)
• type Type

Functions

func DecodePostgresToJson

func DecodePostgresToJson(event *insaneJSON.Root, data []byte) error

DecodePostgresToJson decodes postgres formatted log and merges result with event.

From:

"2021-06-22 16:24:27 GMT [7291] => [3-1] client=test_client,db=test_db,user=test_user LOG:  listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\""

To:

{
	"time": "2021-06-22 16:24:27 GMT",
	"pid": "7291",
	"pid_message_number": "3-1",
	"client": "test_client",
	"db": "test_db",
	"user": "test_user",
	"log": "listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\""
}

Types

type CRIRow

type CRIRow struct {
	Log, Time, Stream []byte
	IsPartial         bool
}

func DecodeCRI

func DecodeCRI(data []byte) (row CRIRow, _ error)

DecodeCRI decodes CRI formatted event to CRIRow.

Examples of format:

"2016-10-06T00:17:09.669794202Z stdout P log content 1"
"2016-10-06T00:17:09.669794203Z stderr F log content"

type Decoder

type Decoder interface {
	Type() Type
	DecodeToJson(root *insaneJSON.Root, data []byte) error
	Decode(data []byte, args ...any) (any, error)
}

func NewJsonDecoder

func NewJsonDecoder(params map[string]any) (Decoder, error)

func NewNginxErrorDecoder

func NewNginxErrorDecoder(params map[string]any) (Decoder, error)

func NewProtobufDecoder

func NewProtobufDecoder(params map[string]any) (Decoder, error)

type NginxErrorRow

type NginxErrorRow struct {
	Time         []byte
	Level        []byte
	PID          []byte
	TID          []byte
	CID          []byte
	Message      []byte
	CustomFields map[string][]byte
}

type PostgresRow

type PostgresRow struct {
	Time             []byte
	PID              []byte
	PIDMessageNumber []byte
	Client           []byte
	DB               []byte
	User             []byte
	Log              []byte
}

func DecodePostgres

func DecodePostgres(data []byte) (PostgresRow, error)

DecodePostgres decodes postgres formated log to PostgresRow.

Example of format:

"2021-06-22 16:24:27 GMT [7291] => [3-1] client=test_client,db=test_db,user=test_user LOG:  listening on Unix socket \"/var/run/postgresql/.s.PGSQL.5432\""

type Type

type Type int

const (
	NO Type = iota
	AUTO
	JSON
	RAW
	CRI
	POSTGRES
	NGINX_ERROR
	PROTOBUF
)